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Your question is pretty vague. It might help if you specify what you want to know. I'm sure the answers you are looking for are here if you let us know what it is you want to know the difference in. They are very differnt body wise, but share some mechanical identity.
Sorry bout being vague not a good typer , a chicken pecker. Ha ha . Father gave me his fathers f-600 and want to find out as much as can about it this truck has no rust, garage kept in great shape
Father had 57 on registration but in the glove box t.he orginal book that comes with trucks has 56. And doing some looking its got to be a 56 plus its got the bull nose like u described.